Bow fastener



(No Model.)

P. MINK.

WATCH-BOW FASTENBR.

nu, &

0 K N u Attorney.

ANDREW B GRAHAM.PHOTU-UTHQWASHWGTOMDC UNITED STATES PATENT OEEIcE.

FRITZ MINK, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE KEYSTONEIVATCI-I CASE COMPANY, OF SAME PLACE.

WATCH-BOW FASTEN ER.

SPECIFICATION forming part of Letters Patent No. 560,813, dated May 26,1896.

Application filed October 29, 1895. Serial No. 567,229. (No model.)

To all whom, it may concern.-

Be it known that I, FRITZ MIN K, of the city and county of Philadelphia,State of Pennsylvania, have invented an Improvement in atch-BowFastenings, of which the following is a specification.

My invention relates to watch-bow fastenin gs; and it consists ofcertain improvements which are fully set forth in the followingspecification and are shown in the accompanying drawings.

My invention is designed for locking the ends of a bow againstwithdrawal from the sockets of the pendant, and relates particularly tothat class of fastening devices which are shown in Letters Patent ofDavid Glickman, No. 300,706, dated June 17, 188i. In the constructionshown in that patent the ends of the bow are provided with heads and areinserted through apertures in the pendant, and a notched plate, sleeve,or collar on the inside of the pendant engages the heads and preventstheir withdrawal through the apertures of the pendant. Bow-fasteningsconstructed in this manner have been extensively used. It has beenfound, however, that the constant friction between the heads of the bowand the surface of the collar, owing to the swinging of the bow ends ontheir bearings, tends to wear away the heads of the bow where they areengaged by the collar, and consequently to weaken the fastening. Thisfriction is due to the fact that the tubular collar or locking-pieceemployed, having a curved face where it engages the heads, is constantlyrubbed by the heads as they turn when the bow swings. This constantrubbing wears away the metal of the heads.

It is the object of my invention to improve this construction and removethe existing defeet by so constructing the locking-plate or collar thatthe friction upon the ends of the bow will be evenly distributed,thereby increasing the efficiency of fastenings of this character. Forthis purpose instead of using a tubular locking-piece, or one having acurved surface where it engages the bowheads, I provide a locking-piecehaving a flattened face at the part which engages the head. Thispresents a flat face to the bow-heads, and

consequently they do not tend to rub against the face of the plate atthe edges when they are turned.

In the accompanying drawings, Figure 1 is a vertical sectional view of awatchcase-pendant with the bow having its ends fastened by my improvedfastening device. Fig. 2 is a horizontal sectional view of the same onthe line so of Fig. 1. Fig. 3 is a perspective view of my improvedlocking-piece; and Fig. at is a view similar to Fig. 3, showing thetubular locking-plate employed without the flattened faces, as in myconstruction.

A is the watchcasependant, having the apertures a in its sides, intowhich the ends B of the bow C are inserted.

D are the heads on the ends of the bow.

E is the locking plate or piece, preferably consisting of a tubularcollar adapted to be inserted in the interior of the pendant and slippeddown to engage the heads D of the bow. This piece is usually notched, asat e, the notches fitting over the bow behind the heads D.

The two faces of the collar which engage the bow and fit behind theheads are flattened, as at F, so as to present a flat face to thebowheads, which, consequently, will not rub against thelocking plate orpiece at the edges, as in the case where the opposed face is curved.This is clearly illustrated in Fig. 4, which shows an ordinary curvedtubular lockingpiece G. It will be seen that the heads D will bearagainst the opposed curved face of the plate G at their outer edges, andthat there will be a constant rubbing at these points when the bowswings. WVith my construction, however, there is no friction at thesepoints, where the metal is weakest, but flat bearingfaces are presented,so that the friction is evenly distributed.

Instead of making the locking-piece E in one piece it may be made inparts, as indicated in dotted lines in Fig. 3.

The minor details of construction shown may be varied without departingfrom the invention.

What I claim as new, and desire to secure by Letters Patent, is

1. A watch-bow fastening consisting of the pendant having apertures toreceive the ends the inner and outer faces adjacent thereto flat- T0 ofthe how, the bow having its ends inserted tened. v

in the apertures and provided with heads, and In testimony of whichinvention I have the looking-plate having the two faces which hereuntoset my hand.

5 en 'a e the bow and fit behind the heads flatr T T B6565 as at F topresent fiat faces to the bow FRI P Z heads. Witnesses:

2. The locking-plate having a notch to en- FREDERIO \V. HUNTER,

gage the headed ends of the bow and having ERNEST HOWARD HUNTER.

